Impressive unusual taste in heartless lady (7)

I believe the answer is:

stately

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'impressive' is the definition.
(similar in meaning)

'unusual taste in heartless lady' is the wordplay.
'unusual' indicates anagramming the letters.
'in heartless lady' becomes 'ly' (I am not sure about this - if you are sure you should believe this answer much more).
'taste' with letters rearranged gives 'state'.
'state'+'ly'='STATELY'

Can you help me to learn more?

(Other definitions for stately that I've seen before include "Courtly; imposing" , "Impressive in appearance; majestic" , "Dignified and impressive" , "Imposing, grand" , "` `In Xanadu did Kubla Khan / A ....... pleasure-dome decree' ' (Coleridge)" .)

I've seen this clue in The Mirror.

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